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Dienogest was synthesized in 1979 in Jena , Germany under the leadership of Prof. Kurt Ponsold, was initially referred to as STS-557 . [28] [29] It was found that its potency was 10 times that of levonorgestrel . [30] The first product on the market to contain dienogest was a combined oral contraceptive pill (with ethinylestradiol), Valette, introduced in 1995 and made by Jenapharm . [31] In 2007, dienogest was introduced as Dinagest in Japan for the treatment of endometriosis, and it was subsequently marketed for this indication as Visanne in Europe and Australia in December 2009 and April 2010, respectively. [5] Qlaira was introduced in Europe in 2009 and Natazia was introduced in the United States in 2010. [32]